refactor: migrating identicon component to typescript

[SAHU-01]

Refactored code for #2349 identicon component typescript migration

Changes

• Added src/components/identicon/identicon.tsx (functional TSX component using react-identicons)
• Deleted legacy src/components/identicon/Identicon.js
• Converted Storybook to TS: identicon.stories.ts with proper Meta/StoryObj typing
• Added local type defs for lib: src/types/react-identicons.d.ts
• Updated import in src/components/cid/Cid.js to new path: ../identicon/identicon.js
• Update tsconfig.json includes for new .tsx/story files

Tests

• Build: no errors (npm run build passes)
• Lint: no issues (npm run lint passes)
• Storybook: toggling identicon renders/hides the identicon correctly in Cid V0 → Identicon stories (size/className controls behave as expected, onClick argument has been removed from stories).

Screenshot/Recording

Screen.Recording.2025-09-28.at.10.14.19.PM.mov

Reviewers: @SgtPooki